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    <title>Document</title>
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<body>
    <script>
        let score = +prompt('请输入你的分数: ');
        if(score >= 90) {
            alert('优秀');
        } else if (score >= 80) {
            alert('良好');
        }else if (score >= 60) {
            alert('及格');
        } else {
            alert('不及格');
        }
    </script>
</body>
</html>